Design a simple 12v circuit

Discussion in 'Digital Circuit Design' started by shark669, Aug 24, 2018.

  1. shark669

    Thread Starter New Member

    Jan 30, 2017
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    Hi all
    I would like to build my little girl a bead spinner , my background is software so I have limited electronics background.
    I have some old hardware laying around that I would like to use for this project
    the goal is to be able to run this motor in multiple speeds using a potentiometer.

    Here is the list of items I have:
    A motor i pulled from old printer (I'm pretty sure its 12v rated, tested it on 12v its working fine, not working on 9v)
    I have a 12v 1500ma rated power supply
    2 Potentiometers one is rated 10K the other is 50K
    Bunch of different resistors (10,100,200,330,1K,2K,10K,220k?5.1K, 1M, and big 10 Ohm 2w resistors)
    On off switch.

    I uploaded images of the hardware here: https://imgur.com/a/MC0n3xq

    Appreciate if you guys can assist designing this simple circuit.
    Thank you!
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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  3. shark669

    Thread Starter New Member

    Jan 30, 2017
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  4. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    You can't do it with only the components that you have. Post #2 is the way to go.
     
  5. shark669

    Thread Starter New Member

    Jan 30, 2017
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  6. ScottWang

    Moderator

    Aug 23, 2012
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    The circuit in the links of post #5 is not a good way, you can build one or buy one from Ebay --
    12V NE555 pwm motor driver (NPN Transistor), the circuit should be similar as Max posted in the post #2 (N MOSFET).
     
  7. shark669

    Thread Starter New Member

    Jan 30, 2017
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    Thank you Scott
    I was really hoping not to spend $9 on this.
    Can you please explain why is is not a good way?
    If its going to work what is the issue?
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    $1.51 !
    Ebay 172255836155
    Max.
     
    -live wire- likes this.
  9. shark669

    Thread Starter New Member

    Jan 30, 2017
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    This is a winner !!!
    Thank you very much
     
  10. ArakelTheDragon

    Well-Known Member

    Nov 18, 2016
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    You will always need the diodes! Please be carefully not to burn your daughter of the self made device catches fire.
     
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  11. ScottWang

    Moderator

    Aug 23, 2012
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    What I concerned was the current may destroy the carbon of VR(potentiometer) and reduce the usage life and causes some other problems, if you don't care that then you can try it, because that is a really simple way.

    If you can find the wirewound variable resistor and that is worth to try, but it is more expensive.
     
    -live wire- likes this.
  12. Aswinth

    New Member

    Nov 1, 2016
    23
    5
    Apart from what you have you either have to buy a 555 timer or an Aduino Microcontroler. Keeping in mind that you have some software experience I think it would be a better choice to buy an Arduino than spending your time with 555 timer circuits. This way you should also be able to do lot of more electronics projects in future.

    Still if you like to stick on to 555 Timer then #2 post is the way to go. Or if you have changed your mind for an Arduino then the project will very simple additional you have to use an motor driver module also like L293D. You can refer for circuit diagram and code here

    https://circuitdigest.com/microcontroller-projects/dc-motor-control-with-arduino-uno-pwm
     
    dendad likes this.
  13. shark669

    Thread Starter New Member

    Jan 30, 2017
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  14. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Thanks, but spend it on parts. there will be other projects!;)
    Max.
     
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